<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .mian {
            width: 1200px;
            height: 580px;
            margin: 100px auto;
        }
        .one {
            float: left;
            width: 230px;
            height: 580px;
            background-color: #999999;
        }
        .two {
            float: right;
            width: 970px;
            height: 580px;
            background-color: #ccffcc;
        }
    </style>
</head>
<body>
    <div class="mian">
        <div class="one"></div>
        <div class="two"></div>
    </div>
    
</body>
</html>